What is 3x3 4x4?

The expression "3x3 4x4" seems to refer to two separate multiplications: 3 multiplied by 3, which equals 9, and 4 multiplied by 4, which equals 16. If you are looking for the result of these multiplications together, it could be interpreted as two separate results: 9 and 16. If you meant to combine them in some way, please clarify your question.